Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44e9dfefb746ab5…

MALICIOUS

PDF

29.4 KB Created: 2021-07-19 18:00:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 754c3886289fb9bd31d94ec90d0b81fd SHA-1: dd2031fc164c79baa6425a7f3986cfd70035129b SHA-256: f44e9dfefb746ab584b59fe75daac2a5e8da46716835b2eaa19bc475ef5a2abc
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a redirector lure, specifically linking to a 'free generator / game hack'. The embedded URL, http://netcdn.tw/app/835599320/buy-tiktok-followers-free-game-hack, is identified as malicious infrastructure. The document body also contains similar text and URLs, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0573

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/835599320/buy-tiktok-followers-free-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x216C 21796 bytes
SHA-256: a5a107972c2c84b9d01d336751ba2cbaa51802631dcae68a74297052813bdf8f
font_01_sfnt_off000051b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51B3 18232 bytes
SHA-256: 961899ff1eb424bdaf12ead7fcaccf2d09ae623c60a9c1ffe8485e19a18d4dd1